Explanation: The legend in the bottom left of the map shows the answer to this question: the Oregon territory was acquired from Britain.. The treaty that gave this to the U.S. was negotiated 2 years prior to the Mexican War, which had no effect on Oregon. All of these demonstrate the country's "Manifest Destiny" to settle the entire continent.
Originally define who was eligible to vote, allowing each state to determine who was eligible. In the early history of the U.S., most states allowed only white